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What does Null File Path mean?

Null file path during an LTO process means:

1.) The file(s) has/have been changed/altered/offline while the backup is running so the backup job will not be able to find the file(s).

2.) The file(s)/folder(s) contain illegal characters that the Windows OS are not accepting and must be altered for the OS to process the backup

3.) The file(s)/folders(s) are too long in length or are too deep in file path that it considers the character count too long

Windows Server 2012: 255 for both files and folders combined for the entire path.

Windows Server 2016: 255 for individual files/folders.  Total for path has an extremely high limit.